The Military-industrial Scientific Research System of the Academic Master Chapter 627

Chapter 627 The confusing vertical takeoff and landing

Facing this completely sudden request, Chang Haonan was a little confused at first.

After all, when he first arrived here in the morning, although he didn't think deeply about Jiang Fuhe's emotions, he could still feel them.

　　Why did it take less than half a day for your attitude to make a 540° turn?

 As you hear the word, it doesn't mean “join” but directly invites oneself to “take over” a project.

Moreover, it's not just that.

 More importantly, I still didn't expect that there would be such a thing as a vertical take-off and landing engine.

 Although at this point in time, Institute 624 should indeed have obtained some technical information of the R79V300 engine.

 But he was very sure that he had never had a project like this in his previous life.

Even if China's research on vertical take-off and landing aircraft must be said to exist, it is limited to the Warhammer-flavored J-6 vertical take-off and landing model in the 1970s.

 The idea is extremely wild, which is to hang four lift fans directly outside the J-6.

 But that has to be sold together with a light aircraft carrier or amphibious assault ship.

 Fortunately, Jiang Fuhe was not a very narrow-minded person, and he knew rationally that the other party would most likely not be aware of the twists and turns in the process, so he took several deep breaths in succession to calm down his emotions that were almost red-hot just now.

Vertical take-off and landing is something that can be done, but it can also be done without.

Heaven and earth conscience, he really just wanted to satisfy his curiosity by asking this question, and had no other intention at all.

 But Jiang Fuhe didn't feel right about it——

 If it is really implemented, in addition to giving it to the naval aviation force for fun, it will most likely have to be used for export.

 Arms sales of this level depend on international influence.

 The ones that follow are basically the works of aviation enthusiasts, and they are countless.

Therefore, Chang Haonan did not choose to agree or reject immediately, but asked about the origin of the project itself:

Now the instigator actually asked this question directly, which has the beauty of an in-person NTR.

"I just...don't know what the vertical take-off and landing engine you are talking about...comes from?"

After all, the combat effectiveness is definitely not as good as that of fixed-wing aircraft with the same technical level, and China does not have the same need as the United States to bully children all over the world.

 In fact, for China today, the priority of vertical takeoff and landing aircraft is definitely not high.

“Mr. Jiang, it's still early before the turbofan 10 is finalized and put into service. I can't make a decision now on whether I can participate in a new project...”

 Although due to Chang Haonan's intervention, Huaxia's level in the aviation industry and even the entire manufacturing field is now much higher than in its previous life.

 At the moment, China in the late 1990s is obviously not up to par.

 After all, regardless of the feasibility, at least an idea has been truly formed at the aviation industry level.

After all, the reason why he studied vertical takeoff and landing was because the original thrust-to-weight ratio of 9-level thrusters was occupied by something like the turbofan 10, which is infinitely close to the fourth generation of core machines, so he had no choice but to take an eccentric approach.

 Limited resources must still be focused on key projects.

 But comprehensive national strength cannot be reversed in one or two years.

Even so, it is already the most serious project in this direction.

 But when I think about it, it becomes even more uncomfortable——

Although it is said that his project was killed by Chang Haonan, during the whole process, the latter probably did not realize what happened...

 Before others exert their strength, I have already fallen...

 I'm so angry, but there's nothing I can do.

 “Mr. Jiang?”

Looking at Jiang Fuhe, who had an increasingly troubled expression on his face, Chang Haonan was a little worried that he might have irritated the other person, so he cautiously gave another tentative shout.

"ah?"

"oh…"

 Jiang Fuhe decided to reconcile with himself for the second time.

This kind of thing happens only once or countless times.

So, he tried to keep his tone as calm as possible: "Mr. Chang may not know something. Our hospital raised funds by itself a few years ago and purchased some technical data of the R79V300 engine. It was originally intended to be used as the technical motherboard for the fourth-generation engine. Book."

“But it was later discovered that the performance of the core engine was not enough. Even if our country's production process was not taken into account, the thrust-to-weight ratio would be 8.5-9, which does not meet the power requirements of the fourth-generation engine.”

 Actually, of course he knew this story.

Although the R79 engine is already a bit like a fourth-generation engine in terms of core engine level, most of the technology and design ideas are still third-generation, and it is unlikely that it will be used in the third and a half generations.

 At least the stage pressure ratio of the compressor cannot be compared with today's turbofan 10.

The choice of a radical core aircraft structure is largely just to reduce the weight of the engine to support the vertical take-off and landing function of the Yak 141 aircraft.

 So it is reasonable to squeeze out less than 10 level push weight ratio.

 Otherwise, the Russians themselves would not have to bother developing the AL41F and AL51F later.

However, at this time, you should definitely let the other party continue talking.

Hence, he deliberately made a puzzled expression, and even adjusted his sitting posture specifically to suit his unrealistic acting skills:

 “Is there such a thing?”

“Yes, we will later apply some new technologies based on its design to create a fourth-generation core machine with a 3-8-1-1 or 3-7-1-1 structure.”

 When Jiang Fuhe said this, he leaned back in his chair, but did not feel the expected heart palpitations. He was probably relieved:

“As a result, before we officially started taking action, Academician Liu invited us to participate in the design review meeting of your Taihang project, and found that this idea had already been preempted, and the degree of completion was very high.”

"Although the state's investment in the aviation industry has increased in the past two years, it is obviously impossible to support two similar aviation projects at the same time. But having said that, the technical data of the R79 is self-raised by our institute, so it is impossible to just After much deliberation, the only way out was to let it go back to its old business.”

At this moment, Chang Haonan finally knew what was going on with the weird look on the other side that started this morning and lasted until just now.

 It turned out that without knowing it, I almost killed a project that others had high hopes for—

Although in the original timeline, the project derived from the R79 core machine ended without any problem, at least in Jiang Fuhe's current view, the "culprit" must be Chang Haonan who can't run away.

After a slight pause, and after adjusting his mentality again, Jiang Fuhe continued:

"We have been studying vertical takeoff and landing for a year now, and other parts are fine. It is just that the thrust between the lift fan and the main fan is not well balanced. We have done several simulation tests with old models of engines. "The thrust fluctuates greatly. If it were to be installed on an airplane, it would probably overturn midway through takeoff."

“So, when I just heard you say that the distributed control gain matrix can be used to improve the accuracy and stability of thrust control, I wondered if this technology could also be used on our model.”

 “Technically there must be no problem…”

Chang Haonan lowered his head and was about to analyze the pros and cons of this vertical takeoff and landing project, when he suddenly caught a key word from the other party:

 “Wait...you just said...lift fan?”

"yes."

 Jiang Fuhe nodded:

"We have also studied the scheme of Yak 141's main engine and lift engine. Although the principle is relatively simple, the lift engine is completely useless in level flight. The dead weight is too large, and more importantly, between different engines, It's too difficult to balance the lift.”

“So we were thinking about whether we could use one engine, but output the thrust through two sets of fans. This would at least make the balance a little easier. Of course, the demand for the engine itself would be higher..."

Hearing this, Chang Haonan couldn't help but sigh. China actually has some capable people in the field of aviation development.

You must know that the JSF project on the other side of the ocean at this time is only a few PPTs. The vertical take-off and landing models of X32 and X35 have not yet been seen, and there are only a few words about relevant technical solutions.

In other words, Jiang Fu and their ideas are definitely not backward, but they are limited by objective conditions and many of their ideas cannot be used.

In view of this, Chang Haonan swallowed back the polite words of rejection that were already on his lips:

“Vertical take-off and landing engines are indeed a promising technology.”

“In this way, after the test of the turbofan 10 is completed, I will systematically organize the related technologies of the distributed control gain matrix into materials.”

 “As for hosting the project…”

Chang Haonan waved his hand:

“After the A and B types of the Turbofan 10 are completed, the next step should be to turn it into a true fourth-generation engine. This process may take several years.”

"For me personally, firstly, I probably can't spare the time and energy to participate in two projects that are far apart. Secondly, it's not easy to take away the beauty of others. This engine is a self-funded project of your hospital. Even if it is done in the future, After being transformed, you should be the main capturing unit.”

“However, if Mr. Jiang needs it, we can communicate at any time. We are all colleagues.”

Chang Haonan's response can be said to be quite appropriate.

Even Jiang Fuhe felt a little embarrassed because of his thoughts in the previous half day.

“Then, I would like to thank Mr. Chang in advance for his support...”

As they spoke, the two shook hands again.

 Only this time, Jiang Fuhe finally showed a sincere smile.

 (End of this chapter)

Chapter end